Not sure if this is something you changed or if my host did something without my knowledge.  In the previous version I could actually see the tests running as the results printed to the page.  With the beta 2 version, the text doesn't render until the page is fully loaded.  Perviously with beta 1, I noticed that when I took your suggestions...

output_buffering = Off (change the Off to On)
output_handler = (switch to output_handler = ob_gzhandler )

It would also force the page to load before displaying any ofthe test results.  

I tested the output buffering ini setting and it didn't add much in the way of a performance increase, so I took it off.  And now with Beta2, it seems to be buffering.

For what it's worth, I liked the instant feedback of before.  Some of these tests take 80 seconds or more to fully complete.  And not seeing anything is a little disconcerting.  If nothing else, a flash animation or an animated  gif would be a good idea.